/*
 * Copyright 2007-2008 Michele Mostarda ( michele.mostarda@gmail.com ).
 * All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.asemantics.anthill;

import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.List;
import java.util.ArrayList;

/**
 * Defines a criteria to filter the task names to be exposed by this listener.
 */
public class TargetFilter {

    /**
     * Ecludes a target name by a given criteria.
     */
    public class Exclude {

        /**
         * Regular expression defining the name of target to exclude.
         */
        private Pattern pattern;

        /**
         * Constructor.
         */
        public Exclude() {
        }

        /**
         * Sets the regex value.
         *
         * @param re
         */
        public void setRegex(String re) {
            pattern = Pattern.compile(re);
        }

        /**
         * Returns <code>true</code> if <i>str</i> matches with
         * <i>pattern</i>, <code>false</code> otherwise.
         *
         * @param str
         * @return
         */
        protected boolean matches(String str) {
            Matcher matcher = pattern.matcher(str);
            return matcher.matches();
        }
    }

    /**
     * List of excluded targets.
     */
    private List<Exclude> excluded;

    /**
     * Constructor.
     */
    TargetFilter() {
         excluded = new ArrayList<Exclude>();
    }

    /**
     * Creates a sub element <i>ExcludeTarget</i>.
     *
     * @return
     */
    public Exclude createExclude() {
        Exclude exclude = new Exclude();
        excluded.add(exclude);
        return exclude;
    }

    public boolean matches(String target) {
        for(Exclude exclude : excluded) {
            if( exclude.matches(target) ) {
                return true;
            }
        }
        return false;
    }


}
